In pictures: Landmarks turn off their lights for Earth Hour

Iconic global monuments including the Eiffel Tower, the Kremlin, the Acropolis in Athens and Sydney's Opera House plunged into darkness Saturday to mark Earth Hour and draw attention to climate change.

The event, which originated in Sydney, has grown to become a worldwide environmental campaign, celebrated across all continents.

People in India lit candles to mark the event. (AAP)

Click through to see how the world switched off.

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In London, Big Ben, the Houses of Parliament and the London Eye were among 270 British landmarks that switched off. (AAP)